Dell PowerEdge C6220 II - Manual (Page 267)

Removing and Installing System Components | 267
11 Remove the screws that secure the upper middle plane to the middle
plane holder. See Figure 3-83.
12 Lift the upper middle plane out. See Figure 3-83.
Figure 3-83. Removing and Installing the Upper Middle Plane
1 screw (8) 2 upper middle plane